The average weight of 15 students in a class increases by 1.5 kg when one of the students weighing 40 kg is replaced by …

The average age of seven boys sitting in a row facing North is 26 years. If the average age of the first three boys is 1…

The average temperature on Tuesday, Wednesday, and Thursday was 41 degrees, and on Wednesday, Thursday and Friday was 40…

The average weight of 12 parcels is 1.8 kg. Addition of another new parcel reduces the average weight by 50 gm. What is …

In a class with a certain number of students, if one student weighting 50 kg is added then the average weight of the cla…

If the mean of 4 observations is 20, when a constant 'c' is added to each observation, the mean becomes 22. The value of…

The average salary of all the workers in a workshop is Rs. 8000. The average salary of 7 technicians is Rs. 12000 and th…

The present age of a father is 3 years more than three times the age of his son. Three years hence, father's age will be…